In a previous age, there was a TV show - Rowan & Martin's Laugh-In - which featured a recurrent gag skit by Arte Johnson. Short little guy, looked kinda like Albert Einstein, riding a much-too-small tricycle. He'd routinely be riding along, stop briefly, then simply tip over to one side. (Trust me, it was funny in 1967.)

You'll fall a bunch of times like that, as we all have done, until you master any sort of clip system (toeclips or "clipless"). It'll get better.

As I recall, proper etiquette at such times calls for faking an epileptic seizure while lying on the ground, then simply getting back up & riding off as if nothing had happened.